<!DOCTYPE html>
<html lang="en" xmlns:v-bind="http://www.w3.org/1999/xhtml">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .active{
            border: 1px solid red;
        }
    </style>
</head>
<body>
<div id="app">
    <img :src="imgSrc"  :title="imgTitle" :class="{active:isActive}" @click="toggleActive" alt="">
    <br>
    <img v-bind:src="imgSrc" alt="">
</div>
<!-- 开发环境版本，包含了有帮助的命令行警告 -->
<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
<script>
    var app=new Vue({
        el:"#app",
        data:{
            imgSrc:"http://www.itheima.com/images/logo.png",
            imgTitle:"黑马程序员",
            isActive:false
        },
        methods:{
            toggleActive:function () {
                this.isActive=!this.isActive;
            }
        }
    })
</script>
</body>
</html>